Tank asset's meshes disordered in Unity
This is because the models were transformed in world space (Object mode) in Blender. To fix, you need to make everything have a common origin or space by resetting their transforms to 1. Otherwise whatever package imports these will try to fit it into their world using said transforms. To fix, simply apply the rotation and scale and maybe even the location as well with Ctrl + A.

Related Animated mesh has incorrect transforms when exported to Unity